Fallback to other version adhering to user-provided spec, if the first can't be fetched

[jakub-g]

$ node --version
v0.10.29

$ nodist 0.8
Couldn't fetch 0.8.27: HTTP 404.
Sorry.

$ node --version
v0.10.29

404 error from the server shouldn't block me from switching the node version. It should fall back to the latest 0.8.x available.

I can work around this using nodist 0.8.26 (which I already have installed before) but nonetheless this, however rare it is, probably should be fixed.

[marcelklehr]

Nodist falls back to the local version list if fetching the list of available versions fails.

The rationale for not retrying probably was, that it's unlikely that fetching the list succeeds and fetching an executable from that list afterwards suddenly doesn't.

However, the outcome in your case is certainly not desirable. I'll see what i can do.

[marcelklehr]

Ok, so the nodejs.org server is actually missing the builds for v0.8.27 (see nodejs/node-v0.x-archive#7805)....